Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92f39ededa5e5faf8a5f7d45ac2117c9126bec70a13e26315b7c0e7e77cdf3d3' 
  AND token = '/84Bq2+tb+T3L2yM1WhCc+1wnVocTjwy6gWWhQVtDgs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}